drivers/pci/pcie/portdrv_core.c

   1 /*
   2  * File:        portdrv_core.c
   3  * Purpose:     PCI Express Port Bus Driver's Core Functions
   4  *
   5  * Copyright (C) 2004 Intel
   6  * Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com)
   7  */
   8
   9 #include <linux/module.h>
  10 #include <linux/pci.h>
  11 #include <linux/kernel.h>
  12 #include <linux/errno.h>
  13 #include <linux/pm.h>
  14 #include <linux/string.h>
  15 #include <linux/slab.h>
  16 #include <linux/pcieport_if.h>
  17
  18 #include "portdrv.h"
  19
  20 extern int pcie_mch_quirk;      /* MSI-quirk Indicator */
  21
  22 static int pcie_port_probe_service(struct device *dev)
  23 {
  24         struct pcie_device *pciedev;
  25         struct pcie_port_service_driver *driver;
  26         int status = -ENODEV;
  27
  28         if (!dev || !dev->driver)
  29                 return status;
  30
  31         driver = to_service_driver(dev->driver);
  32         if (!driver || !driver->probe)
  33                 return status;
  34
  35         pciedev = to_pcie_device(dev);
  36         status = driver->probe(pciedev, driver->id_table);
  37         if (!status) {
  38                 printk(KERN_DEBUG "Load service driver %s on pcie device %s\n",
  39                         driver->name, dev->bus_id);
  40                 get_device(dev);
  41         }
  42         return status;
  43 }
  44
  45 static int pcie_port_remove_service(struct device *dev)
  46 {
  47         struct pcie_device *pciedev;
  48         struct pcie_port_service_driver *driver;
  49
  50         if (!dev || !dev->driver)
  51                 return 0;
  52
  53         pciedev = to_pcie_device(dev);
  54         driver = to_service_driver(dev->driver);
  55         if (driver && driver->remove) {
  56                 printk(KERN_DEBUG "Unload service driver %s on pcie device %s\n",
  57                         driver->name, dev->bus_id);
  58                 driver->remove(pciedev);
  59                 put_device(dev);
  60         }
  61         return 0;
  62 }
  63
  64 static void pcie_port_shutdown_service(struct device *dev) {}
  65
  66 static int pcie_port_suspend_service(struct device *dev, pm_message_t state)
  67 {
  68         struct pcie_device *pciedev;
  69         struct pcie_port_service_driver *driver;
  70
  71         if (!dev || !dev->driver)
  72                 return 0;
  73
  74         pciedev = to_pcie_device(dev);
  75         driver = to_service_driver(dev->driver);
  76         if (driver && driver->suspend)
  77                 driver->suspend(pciedev, state);
  78         return 0;
  79 }
  80
  81 static int pcie_port_resume_service(struct device *dev)
  82 {
  83         struct pcie_device *pciedev;
  84         struct pcie_port_service_driver *driver;
  85
  86         if (!dev || !dev->driver)
  87                 return 0;
  88
  89         pciedev = to_pcie_device(dev);
  90         driver = to_service_driver(dev->driver);
  91
  92         if (driver && driver->resume)
  93                 driver->resume(pciedev);
  94         return 0;
  95 }
  96
  97 /*
  98  * release_pcie_device
  99  *
 100  *      Being invoked automatically when device is being removed
 101  *      in response to device_unregister(dev) call.
 102  *      Release all resources being claimed.
 103  */
 104 static void release_pcie_device(struct device *dev)
 105 {
 106         printk(KERN_DEBUG "Free Port Service[%s]\n", dev->bus_id);
 107         kfree(to_pcie_device(dev));
 108 }
 109
 110 static int is_msi_quirked(struct pci_dev *dev)
 111 {
 112         int port_type, quirk = 0;
 113         u16 reg16;
 114
 115         pci_read_config_word(dev,
 116                 pci_find_capability(dev, PCI_CAP_ID_EXP) +
 117                 PCIE_CAPABILITIES_REG, &reg16);
 118         port_type = (reg16 >> 4) & PORT_TYPE_MASK;
 119         switch(port_type) {
 120         case PCIE_RC_PORT:
 121                 if (pcie_mch_quirk == 1)
 122                         quirk = 1;
 123                 break;
 124         case PCIE_SW_UPSTREAM_PORT:
 125         case PCIE_SW_DOWNSTREAM_PORT:
 126         default:
 127                 break;
 128         }
 129         return quirk;
 130 }
 131
 132 static int assign_interrupt_mode(struct pci_dev *dev, int *vectors, int mask)
 133 {
 134         int i, pos, nvec, status = -EINVAL;
 135         int interrupt_mode = PCIE_PORT_INTx_MODE;
 136
 137         /* Set INTx as default */
 138         for (i = 0, nvec = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) {
 139                 if (mask & (1 << i))
 140                         nvec++;
 141                 vectors[i] = dev->irq;
 142         }
 143
 144         /* Check MSI quirk */
 145         if (is_msi_quirked(dev))
 146                 return interrupt_mode;
 147
 148         /* Select MSI-X over MSI if supported */
 149         pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
 150         if (pos) {
 151                 struct msix_entry msix_entries[PCIE_PORT_DEVICE_MAXSERVICES] =
 152                         {{0, 0}, {0, 1}, {0, 2}, {0, 3}};
 153                 printk("%s Found MSIX capability\n", __func__);
 154                 status = pci_enable_msix(dev, msix_entries, nvec);
 155                 if (!status) {
 156                         int j = 0;
 157
 158                         interrupt_mode = PCIE_PORT_MSIX_MODE;
 159                         for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) {
 160                                 if (mask & (1 << i))
 161                                         vectors[i] = msix_entries[j++].vector;
 162                         }
 163                 }
 164         }
 165         if (status) {
 166                 pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
 167                 if (pos) {
 168                         printk("%s Found MSI capability\n", __func__);
 169                         status = pci_enable_msi(dev);
 170                         if (!status) {
 171                                 interrupt_mode = PCIE_PORT_MSI_MODE;
 172                                 for (i = 0;i < PCIE_PORT_DEVICE_MAXSERVICES;i++)
 173                                         vectors[i] = dev->irq;
 174                         }
 175                 }
 176         }
 177         return interrupt_mode;
 178 }
 179
 180 static int get_port_device_capability(struct pci_dev *dev)
 181 {
 182         int services = 0, pos;
 183         u16 reg16;
 184         u32 reg32;
 185
 186         pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
 187         pci_read_config_word(dev, pos + PCIE_CAPABILITIES_REG, &reg16);
 188         /* Hot-Plug Capable */
 189         if (reg16 & PORT_TO_SLOT_MASK) {
 190                 pci_read_config_dword(dev,
 191                         pos + PCIE_SLOT_CAPABILITIES_REG, &reg32);
 192                 if (reg32 & SLOT_HP_CAPABLE_MASK)
 193                         services |= PCIE_PORT_SERVICE_HP;
 194         }
 195         /* PME Capable - root port capability */
 196         if (((reg16 >> 4) & PORT_TYPE_MASK) == PCIE_RC_PORT)
 197                 services |= PCIE_PORT_SERVICE_PME;
 198
 199         pos = PCI_CFG_SPACE_SIZE;
 200         while (pos) {
 201                 pci_read_config_dword(dev, pos, &reg32);
 202                 switch (reg32 & 0xffff) {
 203                 case PCI_EXT_CAP_ID_ERR:
 204                         services |= PCIE_PORT_SERVICE_AER;
 205                         pos = reg32 >> 20;
 206                         break;
 207                 case PCI_EXT_CAP_ID_VC:
 208                         services |= PCIE_PORT_SERVICE_VC;
 209                         pos = reg32 >> 20;
 210                         break;
 211                 default:
 212                         pos = 0;
 213                         break;
 214                 }
 215         }
 216
 217         return services;
 218 }
 219
 220 static void pcie_device_init(struct pci_dev *parent, struct pcie_device *dev,
 221         int port_type, int service_type, int irq, int irq_mode)
 222 {
 223         struct device *device;
 224
 225         dev->port = parent;
 226         dev->interrupt_mode = irq_mode;
 227         dev->irq = irq;
 228         dev->id.vendor = parent->vendor;
 229         dev->id.device = parent->device;
 230         dev->id.port_type = port_type;
 231         dev->id.service_type = (1 << service_type);
 232
 233         /* Initialize generic device interface */
 234         device = &dev->device;
 235         memset(device, 0, sizeof(struct device));
 236         device->bus = &pcie_port_bus_type;
 237         device->driver = NULL;
 238         device->driver_data = NULL;
 239         device->release = release_pcie_device;  /* callback to free pcie dev */
 240         snprintf(device->bus_id, sizeof(device->bus_id), "%s:pcie%02x",
 241                  pci_name(parent), get_descriptor_id(port_type, service_type));
 242         device->parent = &parent->dev;
 243 }
 244
 245 static struct pcie_device* alloc_pcie_device(struct pci_dev *parent,
 246         int port_type, int service_type, int irq, int irq_mode)
 247 {
 248         struct pcie_device *device;
 249
 250         device = kzalloc(sizeof(struct pcie_device), GFP_KERNEL);
 251         if (!device)
 252                 return NULL;
 253
 254         pcie_device_init(parent, device, port_type, service_type, irq,irq_mode);
 255         printk(KERN_DEBUG "Allocate Port Service[%s]\n", device->device.bus_id);
 256         return device;
 257 }
 258
 259 int pcie_port_device_probe(struct pci_dev *dev)
 260 {
 261         int pos, type;
 262         u16 reg;
 263
 264         if (!(pos = pci_find_capability(dev, PCI_CAP_ID_EXP)))
 265                 return -ENODEV;
 266
 267         pci_read_config_word(dev, pos + PCIE_CAPABILITIES_REG, &reg);
 268         type = (reg >> 4) & PORT_TYPE_MASK;
 269         if (    type == PCIE_RC_PORT || type == PCIE_SW_UPSTREAM_PORT ||
 270                 type == PCIE_SW_DOWNSTREAM_PORT )
 271                 return 0;
 272
 273         return -ENODEV;
 274 }
 275
 276 int pcie_port_device_register(struct pci_dev *dev)
 277 {
 278         struct pcie_port_device_ext *p_ext;
 279         int status, type, capabilities, irq_mode, i;
 280         int vectors[PCIE_PORT_DEVICE_MAXSERVICES];
 281         u16 reg16;
 282
 283         /* Allocate port device extension */
 284         if (!(p_ext = kmalloc(sizeof(struct pcie_port_device_ext), GFP_KERNEL)))
 285                 return -ENOMEM;
 286
 287         pci_set_drvdata(dev, p_ext);
 288
 289         /* Get port type */
 290         pci_read_config_word(dev,
 291                 pci_find_capability(dev, PCI_CAP_ID_EXP) +
 292                 PCIE_CAPABILITIES_REG, &reg16);
 293         type = (reg16 >> 4) & PORT_TYPE_MASK;
 294
 295         /* Now get port services */
 296         capabilities = get_port_device_capability(dev);
 297         irq_mode = assign_interrupt_mode(dev, vectors, capabilities);
 298         p_ext->interrupt_mode = irq_mode;
 299
 300         /* Allocate child services if any */
 301         for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) {
 302                 struct pcie_device *child;
 303
 304                 if (capabilities & (1 << i)) {
 305                         child = alloc_pcie_device(
 306                                 dev,            /* parent */
 307                                 type,           /* port type */
 308                                 i,              /* service type */
 309                                 vectors[i],     /* irq */
 310                                 irq_mode        /* interrupt mode */);
 311                         if (child) {
 312                                 status = device_register(&child->device);
 313                                 if (status) {
 314                                         kfree(child);
 315                                         continue;
 316                                 }
 317                                 get_device(&child->device);
 318                         }
 319                 }
 320         }
 321         return 0;
 322 }
 323
 324 #ifdef CONFIG_PM
 325 static int suspend_iter(struct device *dev, void *data)
 326 {
 327         struct pcie_port_service_driver *service_driver;
 328         pm_message_t state = * (pm_message_t *) data;
 329
 330         if ((dev->bus == &pcie_port_bus_type) &&
 331             (dev->driver)) {
 332                 service_driver = to_service_driver(dev->driver);
 333                 if (service_driver->suspend)
 334                         service_driver->suspend(to_pcie_device(dev), state);
 335         }
 336         return 0;
 337 }
 338
 339 int pcie_port_device_suspend(struct pci_dev *dev, pm_message_t state)
 340 {
 341         return device_for_each_child(&dev->dev, &state, suspend_iter);
 342 }
 343
 344 static int resume_iter(struct device *dev, void *data)
 345 {
 346         struct pcie_port_service_driver *service_driver;
 347
 348         if ((dev->bus == &pcie_port_bus_type) &&
 349             (dev->driver)) {
 350                 service_driver = to_service_driver(dev->driver);
 351                 if (service_driver->resume)
 352                         service_driver->resume(to_pcie_device(dev));
 353         }
 354         return 0;
 355 }
 356
 357 int pcie_port_device_resume(struct pci_dev *dev)
 358 {
 359         return device_for_each_child(&dev->dev, NULL, resume_iter);
 360 }
 361 #endif
 362
 363 static int remove_iter(struct device *dev, void *data)
 364 {
 365         struct pcie_port_service_driver *service_driver;
 366
 367         if (dev->bus == &pcie_port_bus_type) {
 368                 if (dev->driver) {
 369                         service_driver = to_service_driver(dev->driver);
 370                         if (service_driver->remove)
 371                                 service_driver->remove(to_pcie_device(dev));
 372                 }
 373                 *(unsigned long*)data = (unsigned long)dev;
 374                 return 1;
 375         }
 376         return 0;
 377 }
 378
 379 void pcie_port_device_remove(struct pci_dev *dev)
 380 {
 381         struct device *device;
 382         unsigned long device_addr;
 383         int interrupt_mode = PCIE_PORT_INTx_MODE;
 384         int status;
 385
 386         do {
 387                 status = device_for_each_child(&dev->dev, &device_addr, remove_iter);
 388                 if (status) {
 389                         device = (struct device*)device_addr;
 390                         interrupt_mode = (to_pcie_device(device))->interrupt_mode;
 391                         put_device(device);
 392                         device_unregister(device);
 393                 }
 394         } while (status);
 395         /* Switch to INTx by default if MSI enabled */
 396         if (interrupt_mode == PCIE_PORT_MSIX_MODE)
 397                 pci_disable_msix(dev);
 398         else if (interrupt_mode == PCIE_PORT_MSI_MODE)
 399                 pci_disable_msi(dev);
 400 }
 401
 402 int pcie_port_bus_register(void)
 403 {
 404         return bus_register(&pcie_port_bus_type);
 405 }
 406
 407 void pcie_port_bus_unregister(void)
 408 {
 409         bus_unregister(&pcie_port_bus_type);
 410 }
 411
 412 int pcie_port_service_register(struct pcie_port_service_driver *new)
 413 {
 414         new->driver.name = (char *)new->name;
 415         new->driver.bus = &pcie_port_bus_type;
 416         new->driver.probe = pcie_port_probe_service;
 417         new->driver.remove = pcie_port_remove_service;
 418         new->driver.shutdown = pcie_port_shutdown_service;
 419         new->driver.suspend = pcie_port_suspend_service;
 420         new->driver.resume = pcie_port_resume_service;
 421
 422         return driver_register(&new->driver);
 423 }
 424
 425 void pcie_port_service_unregister(struct pcie_port_service_driver *new)
 426 {
 427         driver_unregister(&new->driver);
 428 }
 429
 430 EXPORT_SYMBOL(pcie_port_service_register);
 431 EXPORT_SYMBOL(pcie_port_service_unregister);